Amazon announced three new Kindle Fire tablets: an 8.9” and 7” Kindle Fire HDX and a lower-end Kindle Fire HD. They have faster hardware, better screens, improved software and a new look. The HDX boasts a much higher resolution than the previous Fires with color improvement and a faster processor. The new Fires are ready for work with improved productivity apps like e-mail and document reading and included security features. And they work with your Samsung TV, Xbox or Playstation to turn your big screen into a second screen. Prices start at $139 for the HD and go up to $329 for the HDX.